Add an experimental uv format command (#15017)

As a frontend to Ruff's formatter.

There are some interesting choices here, some of which may just be
temporary:

1. We pin a default version of Ruff, so `uv format` is stable for a
given uv version
2. We install Ruff from GitHub instead of PyPI, which means we don't
need a Python interpreter or environment
3. We do not read the Ruff version from the dependency tree

See astral-sh/ruff#19665 for a prototype of the
LSP integration.

Author: zanieb

Cargo.lock

@@ -21,6 +21,7 @@ license = "MIT OR Apache-2.0"
 
 [workspace.dependencies]
 uv-auth = { path = "crates/uv-auth" }
+uv-bin-install = { path = "crates/uv-bin-install" }
 uv-build-backend = { path = "crates/uv-build-backend" }
 uv-build-frontend = { path = "crates/uv-build-frontend" }
 uv-cache = { path = "crates/uv-cache" }

Cargo.toml

@@ -0,0 +1,37 @@
+[package]
+name = "uv-bin-install"
+version = "0.0.1"
+edition = { workspace = true }
+rust-version = { workspace = true }
+homepage = { workspace = true }
+documentation = { workspace = true }
+repository = { workspace = true }
+authors = { workspace = true }
+license = { workspace = true }
+description = "Binary download and installation utilities for uv"
+
+[lib]
+doctest = false
+
+[lints]
+workspace = true
+
+[dependencies]
+uv-cache = { workspace = true }
+uv-client = { workspace = true }
+uv-distribution-filename = { workspace = true }
+uv-extract = { workspace = true }
+uv-pep440 = { workspace = true }
+uv-platform = { workspace = true }
+fs-err = { workspace = true, features = ["tokio"] }
+futures = { workspace = true }
+reqwest = { workspace = true }
+reqwest-middleware = { workspace = true }
+reqwest-retry = { workspace = true }
+tempfile = { workspace = true }
+thiserror = { workspace = true }
+tokio = { workspace = true }
+tokio-util = { workspace = true }
+tracing = { workspace = true }
+url = { workspace = true }
+